Freds 73 Scamp restore on a budget

Most of my problem is getting the right part. Like now trying to figure out the flex plate to work on a 360 Magnum engine that has been stroked and fit a 904 tranny with a 340 torque converter.
Coming along nicely!
Flexplate need a to be LA 360. Not magnum. Fyi.
Damper is magnum balance.